if you buy a new head unit (whichever one it is, whether its an in-dash MP3 player or a CD-changer compatible unit) make sure you get the wiring harness adapter Scosche VW01 (it usually comes free if you order your head unit from www.sounddomain.com or www.crutchfield.com) and a Metra 40-EU10 (Best Buy, $15) antenna adapter. and use the RCA pre-outs, not the speaker outputs of the new head unit.